Blower



Dec. 21, 1926.

A. FEINBERG ET AL BLOWER Filed August 14, 1925 lill Patented Dec. 21, 192e. y

FFICE..`

ARCHIE FEINBERG, OF CHICAGO, ILLINOIS, AND ISADORE IVI. HALVORSON, OFIROLAND, IOWA., ASSIGNORS TO ARCTIC INU-AIR CORPORATION, OF QHICAGO, ILLINOIS, .A COR- y PORATION OF ILLINOIS.

BLOWER.

Application :tiled August 14, 1925. Serial No. 50,2%.

Ylfhis invention relates to improvements in blowers and especially to blowers of the kind more particularly adapted for use in venti' lating systems and it consists of the matters hereinafter described and more particularly pointed out in the appended claims.

The main object of the invention is to provide a blower which is capable of moving a large volume of air with substantially little, if any, noise in operation. A l

A.' further object of the invention is to produce a blower embodying an improved blade which may, be .readily made of a light gauge metal and is so formed that while relatively stid is capable of a desired amount of flexibility and 'which is free from relatively sharp edges which in rotation produce an objectionable humming or hissing noise.

yl`hese objects of the invention as well as others, together with the many advantages thereof will more fully appear as we proceed with our specification.

In the drawing Fig. 1 is a view in side elevation of a vblower embodying our invention.

lFig. 2 Vis a detail longitudinal vertical sectional view on an enlarged scale as taken on the line 2-2 of Fig. `1.

Fig. 3 is a perspective'view of one of the blades embodied in our improved blower.

lig. d is a detail perspective 'view of part of the improved blower and which will be more fully referred to later.

Referring now in detail to that embodiment of the invention illustrated in the accompanying drawings 1 indicates. the casing of our improved blower and 2 indicates as a whole the rotor or fan thereof. The casing which is made eccentric with reference to the axis of the rotor is preferably arranged in a vertical plane and includes side walls 3-3 and a peripheral wall 4 connecting said side walls. rllhe side walls are made of laminated wood not only to reduce the weight of the blower as a whole but also to eliminate vibration and attending noise. In said side walls are provided inlet openings 5 concentric with the rotor 22 The peripherall wall dis in the form of a portion of a spiral and is made of an increasing diameter with reference to the axis of the rotor from the breast 6 to the horizontal top 7, which breast and top define the discharge end 8 of the basing.- A flexible tubular memf ber 9' connects the discharge end 8 of the casing with a suitable outlet opening 10 in a building wall, deflectors 11 preferably being arranged in the said outlet opening. The flexible member 9 is made of canvas or the like and readily accommodates itself to any small inequality in the lining up of the dis'- charge end of the casing with the outlet opening and absorbs vibration in a manner from a motor 1'?. rlhe rings 12-12 are conn'ected together by a plurality of arcuately spaced blades 18 arranged parallel and equidistant from the shaft 15 and with the inner edge of each blade positioned in a radial plane in advance of the radial plane of the outer edge thereof.

Each blade is made of a strip of substantially thin sheet metal of a length greater than its width and the longitudinal marginal parts thereof are bent over upon the rear side of the blade in order to provide stiffening flanges 19-19 therefor and at the same time provide the rounded edges 20-20 for said blade.. The end portions of each' blade are also bent rearwardly to provide right angle flanges 21--21 which are engaged against the inner surfaces of the rings 12--12 and are secured thereto in any convenient manner, as for instance by screws or bolts. 0n substantially the longitudinal median line of each blade is provided a rearwardly extending V shaped rib'22, formed by upsetting the same in the manner well known.

In thc operation of the rotor, air is drawn in through the inlet openings in the side walls of the casing due to the vacuous condition created by the centrifugal action of the rotor. Said action causes the air thus drawn in to move lradially toward and in between the blades 18 to be discharged toward the discharge end of the casing and thence through the flexible connection and outlet, either directly or by means of a suitable conduit into the room to be ventilated. As the' blades approach said discharge end of the casi the air will have caused the blades to flex sllghtly rearwardly so that the outer edge of the blade is presented to the breast of the casing just below the outlet in a slightly bowed condition so that first the end portions ofsaid blade edgeV and then the mid portion thereof are presented to and will pass said breast, permitting air to Iescape outwardly at said mid portion. The exed condition of the blade as it approaches the breast of ther casing is best shown in Fig. 4. This eliminates the quick c'ut off caused by simultaneously presenting the entire outer edge of the blade to said breast which produces a short hiss or whistle-like noise. The noises heretofore thus produced with a straight edge blade, closely following each other as they do, under the rapid rotation of the rotor or fan become a substantially continuous hum which is objectionable. With our -improved blade flexing somewhat as it does, the air is .relieved from said' outer edge at the middle of the blade so that the quick cut off of air as the blade approaches its no-load position adjacent the breast is eliminated and the noises are so reduced in volume as to render the blower substantially silent in operation.

The shaftof the rotor may be journalledQ in any suitable manner and as shown herein is journalled in bearing blocks 2 3, supported on cross pieces 24 attached at their ends to uprights 25 at the, sides of the casing and one on each side of the inlet opening thereof, only one of said uprights appearing in Fig. 1. The .bottom ends of said uprights are firmly anchored in a concrete base 26 upon which the base of the motor 17 also rests.

Our improved blower is capable of moving large volumes of air with so little noise as to be substantially silent. The blades made asdeseribed are light in weight and thus proportionately reduces the amount of power consumed.'

While in describing our invention we have referred to certain details of construction as well as form and arrangement of parts, we do not wish to be limited thereto except as may be pointed lout in the' appended claims.

We claim as our invention:

v1. A blower embodying therein a rotor including sideI rings. and bladesv connecting said side rings, each blade being formedV to provide rounded inner and outer edges with amasar an outwardly extending rib on its rear side substantially midwaybetween said edges.

2. A blower embodying therein a rotor including side rings, and blades connecting said side rings, each blade having its margina] .edge portions folded over to provide anges on the rear of the blade which define rounded edges for said blades, a portion of said blade between said edges being upset to provide a rearwardly extending V shaped rib on the rear side thereof.

3. A blower embodying therein -a rotor including side rings., and blades connecting said side rings, each blade having its marginal edge portions folded over to provide flanges on the rear of the blade which define rounded edges for said blade, the end portions of each blade being bent rearwardlv to provide ears for engagement with and attachment to said side rings, a portion of said blade between said edges being upset to provide an outwardly extending V shaped rib on the rear side thereof.

4. A blower embodying therein a blower casing having wooden side walls with inlet openings therein anda spirally shaped peripheral wall connecting the same, a rotor arranged concentric with said inlet openings and comprising side rings and metallic blades connecting the same, each blade having rounded edges and a rearwardly pro- .iecting longitudinal rib arranged substantially midway between said rounded edges.

5. A blower embodving therein a blower casing having side walls with inlet openings therein and a spirally shaped peripheral wall connecting the same` said side and peripheral walls defining a discharge opening with a breast adjacent the same, a rotor arranged concentric with said inlet openings and comprising side rings and metallic blades connectinsr the same. said blades each having rounded longitudinal edges and a proiecting rib on its rear side, and being capable of iiexing under pressure as it approaches said breast so that firstthe ends of one of said edges and then the mid portion thereof, pass said breast in the order mentioned.

6. A blade for a blower comprising a strip of sheet metal having its longitudinal marginal portions bent to form longitudinal flanges on the rear side thereof and defining rounded edges for the blade, the mid portion of said blade being upset to form a V-shaped rib on the rear side thereof, the ends of said blades being bent to form rearwardlv extending attaching fianges, with said V shaped rib terminating at said fianges.

7. A blower, embodving therein a blower casing having side walls with inlet openings therein and a spirally shaped peripheral connecting wall, said side walls and peripheral wall defining a discharge opening with a breast adjacent the same, a rotor arrangedconcentric with said inlet openings and comprising side rin and blades connecting said In testimony whereof,I have hereunto set side r1n s, said lades 'being capable of flexmy-hand this 10th day of August, 1925. A ing un er pressure as the approach said breast so that first the en s of one of the ARCHIE FEINBERG. l edges thereof and then the mid portion In testimony whereof, I' have hereunto set thereof, pass said breast in the order menmy hand this 10th da of.August, 1925. tioned. ISADOR M. HALVORSON. 

